Side-closing plate for grinding-mills



F. R. CORNWALL. SIDE CLOSING PLATE FOR GRINDING MILLS.

APPLICATION FILED JAN. 12, I920.

Patented May 10, 1921.

UNITED STATES; PATENT OFFICE.

FREDERICK n. connwarm, ors'r. Lonis, iarssoo'ar, ASSIGNORTO WILLIAMS ATENT CRUSHER AND PULVERIZER COMPANY, 01?

OF MISSOURI.

LGUIS, MISSOURI, A CORPORATION SIDE-CLOSING PLATE 350R GRINDING-MILLS.

1 0 all whom it may concern: I

Be it known that I, FREDERICK R. CORN- WALL, a citizen of the United States, residing at St. Louis, Missouri, have invented certain new and useful Improvement in Side-Closing Plates for Grinding-Mills, of which the following is a full, clear, and eX- act description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

lily invention has relation to improve-' ments in side closing plates for grinders, pulverizers and like machines and consists in the novel details of construction more fully set forth in the specification and pointed out in the claims.

The object of my invention is to provide a side closing plate for mills that may be secured into position without the use of bolts or similar securing devices. A further object is to provide a closing plate which be readily attached and detached and at the same time will be positively fixed in position. Further objects are to provide a side closing plate that is simple, durable, and one that may be cheaply manufactured.

Further objects will be better apparent from a detailed description of the invention in connection with the accompanying drawings, in which- Figure 1 is a side elevation of the mill with part, however, in section on the line 1-1 of Fig. 2, showing my invention applied to the opening in the side of the mill.

Fig. 2 is an end elevation of the mill with part broken away.

Fig. 3 is a view similar to Fig. 1 showing a modified form of closing plate.

Fig. l is a view similar to Fig. 2 only a fragment of the mill being shown, however.

Fig. 5 is a further modified form of the invention.

Fig. 6 is a horizontal section on the line 66 of Fig. 5.

Referring to the drawings, M represents a mill, grinder or like machine provided with a shaft S, the shaft being supported in suitable bearings (not shown) which are mounted in the bearing housing H. The housing H is connected to the mill M by means of a web W substantially semicircular in shape. In the sides of the mill are openings 0 to permit the shaft and rotor to be inserted into Specification of Letters Patent.

7 in order that the Patented May it), 1 921.

Application filed January 12, 1920. Serial No. 350,908.

the The closing of this opening 0 is the sub ect of my invention, and I have provided means of closing the same whereby I take advantage of the proximity of the web to the opening 0 in securing my improved closing plate. The web W is provided with a groove 1, and in this groove, is seated my improved cover plate consisting of complementary members, 2, 2. It will be observed that to seat these plates in the groove 1 it is necessary that they be inserted from above the web, thus requiring slots 3, 3 whereby they may be passed over the shaft n positioning the plates 2,2 over the opening, I first drop the plate 2 over the shaft which passes through the slot 3, seating the said plate in the groove 1. Now when the second plate is placed over the opening, it is necesary that the slot-3 of the plate 2 be rotated a suflicient distance slot 3 of the plate 2' will not be in alinement therewith. In Fig. 1, I have shown the slot 3 rotated to a position diametrically opposite to that of the slot 3., but any amount of rotation is sufiicient provided the two slots 3, 3 are not in alinement. After the plates have been rotated to their proper positions, the slots 3, 8 being; opposite the body of the plates 2, 2, it will be seen that the opening 0 in the mill is effectively closed.

It will be understood that in grinding mills, it is desirable to close up the' mill as effectively as possible in order that no dust or other substance will escape from the mill into the room where it is located.

Referring now to Figs. 3 and i, I have provided a modified form of cover plate comprising principal plate which has a slot 5 to permit its being passed over the shaft S, but in lieu of a second cover plate, I merely use a complementary plate 6 adapted to fit in the slot, thus closing it. In this form, the shaft S has an annular groove 7 in alinernent with the groove 1, and in positioning the closing plate, it is passed over the shaft and the base of the slot is seated in the groove of the shaft, the periphery of the plate being seated as before .in the groove 1. The complementary plate 6 is likewise seated in both grooves 7 and 1.

In assembling the plate 4, it is necessary, after it has been positioned in the groove 7, to rotate the plate clear of the web W, when the plate 6 can be inserted (see dotted position, Fig. 8), after which the assembled plates are positioned, as shown in Fig. 3. It will be seen that when the plates 4: and 6 are assembled, the slot is tightly closed, and we have the equivalent of a solid plate.

In Figs. 5 and 6, I have shown an additional modification consisting of a principal plate 8 provided with a slot 9 and a complementary plate 10 adapted to close said slot, said plate 10 being held in position by the sides of the slot and confining fingers 11, as shown more clearly in Fig. 6.

From the foregoing description, it will be seen that I have provided a side closing plate whereby the ooening in the mill is ef-' fectively closed without the use of bolts, rivets, or the like, the plates being readily placed in position and removed.

It is obvious that the invention is susceptible of modifications without departing from the spirit thereof, and of all of these I wish to avail myself.

I claim:

1. In combination with a mill provided with a side opening, a shaft, a rotatable circular closing plate for said opening comprising a member provided with a slot, and means for closing said slot.

2. In combination with a mill, provided with a side opening and a shaft, a rotatable V circular closing plate orcover comprising complementary members for closing said opening.

3. In combination with a mill provided with a side opening and a shaft, means for closing said opening and comprising a rotatable circular plate with a radial slot, and means for closing the slot.

I. In combination with a mill provided with a side opening and a shaft, means for closing the opening comprising a rotatable circular plate'with a radial slot and a complementaryplate adapted to close said slot.

5. In combination with a mill provided with a side opening and a shaft, means for closing said opening, said means comprising superposed rotatable circular plates.

6. In combination with a mill provided with a side opening and a shaft, means for closing said opening, said means comprising superposed rotatable circular plates provided with slots, said slots being angularly arranged with relation to each other when the plates are rotated in posit-ion to cover the opening.

7. In combination with a mill provided with an opening, a laterally extending web provided with a semi-circular groove adj acent the opening and concentric to the shaft, a rotatable circular closing plate for said opening, said plate being provided with a slot adapted to receive plate is seated in said for closing said slot. 7

8. In combination with a n ill provided with an opening, a shaft extending therethrongh and a laterally projecting web provided with a groove adjacent part of the periphery of said opening, rotatable complementary plates for closing the opening, the plates being provided with slots for regroove, and means the shaft when the ceiving the shaft and being adapted to in said groove, the slots being angnlarly disposed when the plates are seated a1 d rotated relative to each other. i

9. In combination with a mill provided with an opening, a shaft extending therethrough, and a laterally projecting web provided with a groove adjacent part of the periphery of said opening, a slotted plate for closing said opening and rotatably positioned in said groove, and a second plate positioned in the groove and over the first plate, said plates bein capable of relative rotation in the groove to close the opening in the first plate.

10. In combination with a mill provided with a side opening, a shaft extending therethrough, and a laterally projecting web provided with a groove adjacent part of the periphery of said opening, an annular groove in said shaft in alinement with the groove in the web, and a slotted plate for closing the opening, said plate being seated in the groove of the shaft and the groove in the web, and being capable of rotation in the groove, and means for closing said slot.

In testimony whereof I hereunto affix my signature this 7th day of January, 1920.

FREDERICK It. CORNlVr-ELL. 

